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Old 08-07-2008, 03:12 PM
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rogerg (Roger)
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Join Date: Feb 2006
Location: Perth, Western Australia
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Quote:
Originally Posted by Dennis View Post
I think an x0.63 reducer will make an F11 system an F6.93 system?
In theory... but I suspect it'd be quite different, depends what's in the image train. My F/6.3 takes my F/10 scope to about F/7.3

Quote:
Originally Posted by spearo View Post
First real light.
Still working out sweet spots for balancing and guiding etc
5 min subs on the Helix and Sculptor
Nice images for a first night. Perhaps a bit high on the contrast for NGC 253 as viewed on my screen, would prefer that backed off a little. Looks like you have quite a nice flat field there, I would've expected a lot more curvature. I only ever tried my 350D on my 12" LX once and had some curvature visible around the corners.

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